How to Save data as transactions in C# using firebase?

I’m making an quiz game in unity using firebase realtime database. I want to save on firebase what players have answered each questions, and later show to player what others also have answered

Example: Is sky blue? Yes or No

82% has answered Yes

12% has answered No

Firebase doc is using leaderboard setup, that i didn’t understand. Here is the link to firebase doc

I have been struggling with this for many days now. Here is my code that work, but i don’t know how to add all other questions.

   private void AddCount(DatabaseReference clickCountRef)
 {
 
     clickCountRef.RunTransaction(mutableData =>
     {
 
         List<object> counts = mutableData.Value as List<object>;
 
         if (counts == null)
         {
             counts = new List<object>();
             return TransactionResult.Success(mutableData);
 
         }       
         yesFromFirebase = (long)((Dictionary<string, object>)counts[0])["yes"];
         noFromFirebase = (long)((Dictionary<string, object>)counts[0])["no"];
 
         Dictionary<string, object> newCounter =
              new Dictionary<string, object>();
         newCounter["yes"] = yesFromFirebase + yesFB;
         newCounter["no"] = noFromFirebase + noFB;
         counts[0] = (newCounter);
         mutableData.Value = counts;
         yesFB = 0;
         noFB = 0;
         return TransactionResult.Success(mutableData);
 
     });
 }